Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- 53 more...
- ItemWerkema156 - Northern Pacific box car 15529 at Denver, Colorado, in 1965.
- ItemWerkema157 - Northern Pacific box car 17014 at Albuquerque, New Mexico, in 1980.
- ItemWerkema158 - Northern Pacific box car 17410 at Longmont, Colorado, in 1978.
- ItemWerkema159 - Northern Pacific box car 17440 at Albuquerque, New Mexico, in 1980.
- ItemWerkema160 - Northern Pacific box car 18581 at Albuquerque, New Mexico, in 1978.
- ItemWerkema161 - Northern Pacific box car 19779 at Albuquerque, New Mexico, in 1980.
- ItemWerkema162 - Northern Pacific box car 24026 at Albuquerque, New Mexico, in 1979.
- ItemWerkema163 - Northern Pacific box car 24032 at Albuquerque, New Mexico, in 1980.
- ItemWerkema164 - Northern Pacific box car 24367 at Pasco, Washington, in 1981.
- 161 more...